#
# Copyright (c) 2022-2023, Jesús Daniel Colmenares Oviedo <DtxdF@disroot.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

lib_load "${LIBDIR}/check_func"
lib_load "${LIBDIR}/log"
lib_load "${LIBDIR}/random"
lib_load "${LIBDIR}/sysexits"

lib_repeat_run()
{
	local sleep=0
	local total=3

	if [ $# -eq 0 ]; then
		lib_err ${EX_USAGE} "usage: lib_repeat_run [-s random|number] [-t total] cmd [args ...]"
	fi

	while getopts ":s:t:" _o; do
		case "${_o}" in
			s)
				sleep="${OPTARG}"
				;;
			t)
				total="${OPTARG}"
				;;
			*)
				lib_repeat_run # usage
				;;
		esac
	done
	shift $((OPTIND-1))

	local cmd="$1"; shift
	if [ -z "${cmd}" ]; then
		lib_repeat_run # usage
	fi

	if [ "${sleep}" != "random" ]; then
		if ! lib_check_number "${sleep}"; then
			lib_err ${EX_DATAERR} -- "${sleep}: sleep must be a number"
		fi

		if [ ${sleep} -lt 0 ]; then
			lib_err ${EX_DATAERR} -- "${sleep}: sleep must be greater than 0."
		fi
	fi
	
	if ! lib_check_number "${total}"; then
		lib_err ${EX_DATAERR} -- "${total}: total must be a number."
	fi

	if [ ${total} -le 0 ]; then
		lib_err ${EX_DATAERR} -- "${total}: total must be greater than or equal to 0."
	fi

	local cmd_output= cmd_errlevel=0

	local tries=0
	while [ ${tries} -lt ${total} ]; do
		cmd_output=`"${cmd}" "$@" 2>&1`
		cmd_errlevel=$?

		if [ ${cmd_errlevel} -eq 0 ]; then
			if ! lib_check_empty "${cmd_output}"; then
				printf "%s\n" "${cmd_output}" | while IFS= read -r line; do
					lib_debug "${cmd}: ${line}"
				done
			fi
			return 0
		fi

		if [ "${sleep}" = "random" ]; then
			sleep `random_number 0 3`.`random_number 3 9`
		elif [ ${sleep} -gt 0 ]; then
			sleep ${sleep}
		fi

		tries=$((tries+1))
	done

	if ! lib_check_empty "${cmd_output}"; then
		printf "%s\n" "${cmd_output}" | while IFS= read -r line; do
			lib_err - "${cmd}: ${line}"
		done
	fi

	return ${cmd_errlevel}
}
